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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Karling, John S. (John Sidney),
    Edition: 1st ed.
    Publication info: New York city, The author, 1942
    Holding Institution: MBLWHOI Library
    Subjects: Clubroot  Myxomycetes  Plasmodiophorales  Powdery scab  
  2. By: Melhus, I. E. (Irving E.),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1914
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Diseases and pests  Potatoes  Powdery scab